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W2K3 Forest Trust exchange behaviour and roll-back

Posted on 2013-02-05
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Last Modified: 2013-02-21
Hi - we are in the process of merging two companies and looking at implementing a 2 way forest trust.

Both companies are operating AD at 2003 functional level. Our DC's are running on server2008R2 in a vmware environment. Our exchange 2010 and sister company exchange 2003.

Once the forest trust is stablish, would we be able to see contacts on the 2003 exchange?
Will we be able to resolve and synch their GAL?

Thanks
Shaughn
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Question by:snymas
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Expert Comment

by:charlespanth
ID: 38858361
I suggest if you are able to migrate all the mailboxes including the contact list from the Exchange 2003 to Exchange 2010, then you will be able to have the advantage of having the contact list of both the Exchange's present in one Exchange 2010 under the cross forest migration. By this you will automatically be able to resolve and syn the Global Address List in the Exchange 2010 itself.

Thanks
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Author Comment

by:snymas
ID: 38858961
Thank you charlespanth,
They don't want to migrate mailboxes. They want to keep things as they are at the moment with a forest-trust. But they want to be able to resolve both GALs across the trust. Possible?
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charlespanth earned 1500 total points
ID: 38859237
Hi,

I understand your problem

In the case of forest trust there are two types of trust:
Transitive: In this the GAL can be resolved
Non-Transitive: It is not possible

When you are done with the transitive forest trust then theoretically you will be able to resolve in your issue of both GAL's across the trust without the need of migration. I have not much gone into the practicality, but I think that practically also it might be possible.

Thanks
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